Non-return valve, in particular for medical uses

Abstract

A nonreturn valve includes a first tube connection housing and a second tube connection housing and a diaphragm disk between the first and second tube connection housings. The disk can be lifted from an annular valve seat upon an overpressure in an inlet channel and can be pressed onto the valve seat upon an overpressure in an outlet channel. The diaphragm disk has an annular bead received in mutually opposite annular grooves of the tube connection housings. The diaphragm disk is provided, radially outside the valve seat, with openings leading to an outlet chamber. The second tube connection housing lying opposite the openings is provided with recesses which communicate with the outlet channel and are separated from each other by supporting surfaces for the diaphragm disc. The recesses are connected to the outlet channel by narrow deep grooves.

Description

RELATED APPLICATIONS[0001]The present application is national phase of PCT / EP2008 / 006099 filed Jul. 24, 2008, and claims priority from German Application Number 20 2007 011 322.6 filed Aug. 13, 2007 and German Application Number 20 2007 012 680.8 filed Sep. 11, 2007, the disclosures of which are hereby incorporated by reference herein in their entirety.BACKGROUND[0002]1. Technique Field[0003]The invention relates to a nonreturn valve, in particular for medical uses.[0004]2. Related Art[0005]A nonreturn valve of this type, according to an earlier proposal by the applicant, is known from German utility model 20 2006 016 730.7.[0006]These types of nonreturn valves for the medical field are required in infusion systems, diagnostic equipment, intravenous tube lines and the like, and therefore these types of nonreturn valves have to close in a very reliable manner and the closing time must be only fractions of seconds, in order thereby to avoid any backflow of liquids charged with undesir...

AI Technical Summary

Benefits of technology

[0008]The object of the present invention is to further improve this valve of the type mentioned at the outset in terms of high pressures, and to completely eliminate damage or overstretching of the diaphragm disk.

[0009]In a nonreturn valve of the type mentioned at the outset, this object is achieved principally by the fact that the supporting surfaces and the grooves end at the center on a substantially plane support that protrudes in the direction of the diaphragm disk. This affords the advantage that, in the area of the diaphragm disk most sensitive to overstretching, the diaphragm disk is additionally supported centrally on the support in the event of high pressures, such that overstretching in the direction of the recesses between the supporting surfaces can be eliminated.

[0011]In a preferred embodiment according to the invention, the support is designed with a circular shape. This creates particularly favorable conditions in terms of symmetry.

[0012]In a particularly preferred embodiment according to the invention, the diaphragm disk is provided with a protruding, integrally formed reinforcement. This ensures particularly reliable support of the diaphragm disk at high pressures, without the diaphragm disk undergoing excessive wear on the bearing surface on the support.

[0016]The invention can be further refined specifically if the periphery of the support is arranged inside the radius of the opposite valve seat. This ensures particularly trouble-free operation of the valve.

Problems solved by technology

After the pressure has been relieved, it can happen that the diaphragm stays sucked on the support and delays the closure of the valve.

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